Resistance of Bismuth to Alternating Currents. 309 



two components, one 90° and the other 180° behind the 

 current, for the former component may be considered as due 

 to something in the nature of self-induction, and the latter 

 to a real rise in the resistance of the bismuth. 



Table I. shows the values of a 



cos <x (the resistance 



component), and 



E 



e 



E' E 



sin a. (the self-induction component) for 



different frequencies. 



Table I. (See figs. 9 & 10.) 





Angle of lag of 









Frequency. 



" Bismuth E.M.F." 





cos a. - 



-sin a. 



behind the current 



E 1 



] 1 







producing it. 









3 



100 13 



•0040 



0007 



0039 



4 



102 25 



•0047 



0010 



0046 . 



5 



104 35 



•0052 



0013 



0050 



6 



106 20 



•0054 



0015 



0052 



10 



110 20 



•0075 



0026 



0070 



20 



118 20 



•0112 



0053 



0098 



SO 



122 40 



0148 



0080 



0125 



40 



123 50 



0194 



0108 



0161 



50 



125 45 



•0230 



0135 



0188 



60 



126 30 



•0269 



0160 



0215 



Fior. 9. 



Phil Mag. S. 6. Vol. 2. No. 9. Sept. 1901 



